The Weather Wire
November 2004 Volume 11 Number 11
Avg High 65.6
Avg Low 36.1
Snow - 0.0"
Season Snow - 0.0"
Precipitation - 0.86"
Avg High 51.5
Avg Low 23.5
Avg Snow - 10.7"
Avg Precip - 0.98"
Winter Weather Facts.. |
With our fist snowstorm of the season now in the books perhaps it is time to go over some winter weather facts and safety information.
The National Weather Service issues many different types of watches and warnings during the winter months. Here is what they mean.
WINTER STORM WATCH:
Severe winter conditions, such as heavy snow and/or ice, are possible within the next day or two. Prepare now!
WINTER STORM WARNING:
Severe winter conditions have begun or are about to begin in your area. Stay indoors!
Snow and strong winds will combine to produce a blinding snow (near zero visibility), deep drifts, and life-threatening wind chill. Seek refuge immediately!
WINTER WEATHER ADVISORY:
Winter weather conditions are expected to cause significant inconveniences and may be hazardous. If caution is exercised, these situations should not become life- threatening. The greatest hazard is often to motorists.
Below freezing temperatures are expected and may cause significant damage to plants, crops, or fruit trees. In areas unaccustomed to freezing temperatures, people who have homes without heat need to take added precautions.
We as weather forecasters use different wording or terms when we describe a snow event. Whether it is just some flurries or a large winter storm we use different words that best suit the snow event that is expected.
- Light snow falling for short durations. No accumulation or light dusting
is all that is expected.
Rain drops that freeze into ice pellets before reaching the ground. Sleet usually bounces when hitting a surface and does not stick to objects. However, it can accumulate like snow and cause a hazard to motorists.
Rain that falls onto a surface with a temperature below freezing. This causes it to freeze to surfaces, such as trees, cars, and roads, forming a coating or glaze of ice. Even small accumulations of ice can cause a significant hazard.
Snow and or severe cold can be potentially life threatening and every year we see cold and snow related deaths.
Everyone is potentially at risk during winter storms. The actual threat to you depends on your specific situation. Recent observations indicate the following:
Frostbite is damage to body tissue caused by that tissue being frozen.
Frostbite causes a loss of feeling and a white or pale appearance in
extremities, such as fingers, toes, ear lobes, or the tip of the nose. If
symptoms are detected, get medical help immediately! If you must wait for
help, slowly re-warm affected areas. However, if the person is also showing
signs of hypothermia, warm the body core before the extremities.
When CAUGHT in a Winter
Do not eat snow: It will lower your body temperature. Melt it first.
IN A CAR OR TRUCK
Stay in your car or
truck. Disorientation occurs quickly in wind-driven snow and cold.
Make yourself visible to rescuers:
Exercise from time to time by vigorously moving arms, legs, fingers, and toes to keep blood circulating and to keep warm.
AT HOME OR IN A BUILDING
Stay inside. When using ALTERNATIVE HEAT from a fireplace, wood stove, space heater, etc.:
Eat and drink. Food
provides the body with energy for producing its own heat. Keep the body
replenished with fluids to prevent dehydration.
Colorado sees it share of snow during the winter months. The best time to prepare for the next snow is now while the weather is mild and dry. Take an inventory of you winter supplies both for the car and the home and stock in items that you need. Be prepared and the winter snows will be a lot less bothersome this year.
In many portions of Colorado, October 2004 saw normal precipitation, or only slightly under normal. With the moisture, the drought situation either improved or did not worsen across Colorado
The map below shows forecasted temperature deviances for the November2004 time period. As can be seen, above normal temperatures are expected for much of Colorado for November, though the southeaster third of Colorado is forecasted to have below normal temperatures.
The map below shows forecasted precipitation deviances for November 2004. Normal or near normal precipitation is expected for November 2004 all of Colorado.
As can be seen in the below map, drought conditions are expected to continue to improvement across much of Colorado through January 2005.
Although October 2004 started off with above normal precipitation and the last day of the month was also well above normal, the overall last half of the month was dominated with high pressure and dry conditions. The precipitation that occurred Halloween, the 31st, 0.27 inch was not quite enough to get the monthly total up above the normal of 0.99 inch. The month finished with a respectable 0.86 inch, 0.13 inch below normal. Therefore, Denver’s above normal monthly precipitation streak ended at 4. The total for the year now has dropped to below normal. The annual total at the end of October stood at 14.18 inches which is only 0.02 inch below the normal. There were 6 days with measurable moisture which is 1 above normal. DIA measured 1.4 inches of snowfall all recorded on Halloween night. Many areas to the south and west of DIA had as much as 3-6 inches that night. So for the season we have 1.4 inches of snow which is 4.8 inches below normal.
Temperatures ranged from a high of 79 degrees down to a low of 24 degrees. The monthly average was 50.0 degrees which is only 0.1 degrees below normal. There were no temperature records set or tied for the month. There were 9 days when the mercury dropped below the freezing mark, which is normal for October.
Even though November is usually a tranquil month with numerous spring like days, it can also be a snow packed winter type of month. In fact, November is Denver’s 2nd snowiest month. March is the snowiest Denver month and April is behind November in third place.
In 1994 November was the snowiest month of that year with 16.9 inches recorded. On the 13th and 14th of the month, 12.1 inches of snow was recorded during the 24 hour period which is was more than the total of any other month that year. In 1991, 29.6 inches of snow was recorded making it the 2nd snowiest November. In 1992, 20.1 inches of snow was recorded making it the 8th snowiest November. The snowiest November occurred in 1946 with 42.6 inches of snow.
November 2002 marked the 16th month in a row for below normal precipitation for Denver. 2002 was the driest year in Denver weather history. The below normal precipitation streak continued through February 2003, 19 months in a row.
November is tied with May as the month with the least amount of sunshine with 64%. That compares to September that has the most sunshine with 74%. The average November temperature is 37.5 degrees with an average high of 51.5 degrees and an average low temperature of 23.5 degrees. Just 4 years ago, November 1999 finished as the second warmest with an average temperature of 47.1 degrees. And just a year later, November 2000 finished as the second coldest in Denver weather history with an average temperature of 28.9 degrees. The coldest November occurred in 1880 with an icy 22.0 degree average while the warmest November occurred in 1949 with an average temperature of 50.9.
Sunrise/Sunset (Denver area)
10-31/11-1 Storm to be reported on November report.